Arduino Pro Micro (based on the ATmega32U4) is a popular choice for compact PCB designs. Because it is a SparkFun-designed board, the most "canonical" Eagle library is the official SparkFun Eagle Libraries
Paste the .lbr file into the folder. In Eagle, right-click on the "Libraries" folder in your Control Panel and select "Refresh." The new library will now appear. arduino+pro+micro+eagle+library
Print your Eagle board layout on paper at 1:1 scale. Place your physical Pro Micro on the paper. If the pins align with the dots, you are ready to manufacture. Arduino Pro Micro (based on the ATmega32U4) is